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United States Patent | 6,113,329 |
Moroi ,   et al. | September 5, 2000 |
This invention relates to a lock nut in which, when a double nut is fastened against a bolt, projections at the lock nut are deformed and crushed to be applied around the threaded part of the bolt and a frictional force is increased to improve an effect of looseness-prevention. A seat surface of a circumferential edge of the threaded hole 4 of the nut 2 is formed with a plurality of projections 5, 5, 5, the nut 2 is fastened against the fastening nut 7 already fastened against the bolt 6 acting as a member M to be fastened with its projections 5 being faced to the nut, the projections 5 deformed between seat surfaces 3, 8 of both nuts 2, 7 are applied around the threaded part between the threaded hole 4 of the nut 2 and the threaded part 9 of the bolt 6 so as to enable both nuts 2, 7 to be prevented from being loosened.
Inventors: | Moroi; Hideo (Ami 4965, Ami-machi, Inashiki-gun, Ibaraki-ken, 300-03, JP); Tagusari; Eiko (Dai2 Puchikomonzu Yamada, 1-1, Hara-machi 1-chome, Soka-shi, Saitama-ken, 340, JP) |
Appl. No.: | 051909 |
Filed: | April 24, 1998 |
PCT Filed: | July 14, 1997 |
PCT NO: | PCT/JP97/02425 |
371 Date: | April 24, 1998 |
102(e) Date: | April 24, 1998 |
PCT PUB.NO.: | WO98/09086 |
PCT PUB. Date: | March 5, 1998 |
Jul 14, 1997[JP] | 8-241024 |
Current U.S. Class: | 411/223; 411/237; 411/278; 411/291 |
Intern'l Class: | F16B 039/12; F16B 039/22 |
Field of Search: | 411/223,222,237,238,239,240,277,280,290,291,278 |
1209302 | Dec., 1916 | Zottel | 411/222. |
1928982 | Oct., 1933 | Rosenbaum | 411/222. |
1975815 | Oct., 1934 | Wilson | 411/277. |
Foreign Patent Documents | |||
55-110820 | Aug., 1980 | JP. | |
55-115422 | Aug., 1980 | JP. | |
168020 | Oct., 1920 | GB | 411/280. |
489885 | Aug., 1938 | GB | 411/291. |
617597 | Feb., 1949 | GB | 411/280. |